by no cage i assume you mean it has nothing at all and at that 11.5 is the limit. with stock floor pans and (iirc) firewall a roll bar is good to 10.00 so a cage wouldn't be required for 11.20s, only a bar

i would think most tracks (if they're paying attention) are going to boot you if you run under 11.5 anyhow so that being the case i would try to set it up to run 11.50s

all that said i think people get complacent with safety because of the rules and how fast cars are going these days. 11.50s might not sound fast but turn that car sideways at 115 MPH and 11.50s is gonna feel like the space shuttle